/Engine/Source/Runtime/Interchange/Core/Public/Nodes/InterchangeUserDefinedAttribute.h
Get user defined attribute value and optional payload key param UserDefinedAttributeName - The name of the user defined attribute param OutValue - The value of the user defined attribute param OutPayloadKey - The translator payload key to retrieve theFRichCurveanimation for this user defined attribute note - User defined attributes are the DCC translated node user custom attributes (i.e. Maya extra attributes) Payload key will point on aFRichCurvepayload.
template<typename ValueType> static bool GetUserDefinedAttribute ( const [UInterchangeBaseNode](API\Runtime\InterchangeCore\Nodes\UInterchangeBaseNode) * InterchangeNode, const [FString](API\Runtime\Core\Containers\FString) & UserDefinedAttributeName, ValueType & OutValue, [TOptional](API\Runtime\Core\IO\TOptional)< [FString](API\Runtime\Core\Containers\FString) > & OutPayloadKey )